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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1999-11-02 21:48:15 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1999-11-02 21:48:15 +0000 |
commit | 7cc8d6c3b1a207684892d207055ceff9f37d5731 (patch) | |
tree | 3da2f9ee0425a6b49a32df5c8298789de0672add /cpukit/score/src/coresemsurrender.c | |
parent | Split core message queue and watchdog handler objects into separate files. (diff) | |
download | rtems-7cc8d6c3b1a207684892d207055ceff9f37d5731.tar.bz2 |
Split core mutex and semaphore handlers into separate files.
Diffstat (limited to 'cpukit/score/src/coresemsurrender.c')
-rw-r--r-- | cpukit/score/src/coresemsurrender.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/cpukit/score/src/coresemsurrender.c b/cpukit/score/src/coresemsurrender.c new file mode 100644 index 0000000000..dd4839182c --- /dev/null +++ b/cpukit/score/src/coresemsurrender.c @@ -0,0 +1,75 @@ +/* + * CORE Semaphore Handler + * + * DESCRIPTION: + * + * This package is the implementation of the CORE Semaphore Handler. + * This core object utilizes standard Dijkstra counting semaphores to provide + * synchronization and mutual exclusion capabilities. + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <rtems/system.h> +#include <rtems/score/isr.h> +#include <rtems/score/coresem.h> +#include <rtems/score/states.h> +#include <rtems/score/thread.h> +#include <rtems/score/threadq.h> +#if defined(RTEMS_MULTIPROCESSING) +#include <rtems/score/mpci.h> +#endif + +/*PAGE + * + * _CORE_semaphore_Surrender + * + * Input parameters: + * the_semaphore - the semaphore to be flushed + * id - id of parent semaphore + * api_semaphore_mp_support - api dependent MP support actions + * + * Output parameters: + * CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful + * core error code - if unsuccessful + * + * Output parameters: + */ + +CORE_semaphore_Status _CORE_semaphore_Surrender( + CORE_semaphore_Control *the_semaphore, + Objects_Id id, + CORE_semaphore_API_mp_support_callout api_semaphore_mp_support +) +{ + Thread_Control *the_thread; + ISR_Level level; + CORE_semaphore_Status status; + + status = CORE_SEMAPHORE_STATUS_SUCCESSFUL; + + if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) { + + if ( !_Objects_Is_local_id( the_thread->Object.id ) ) + (*api_semaphore_mp_support) ( the_thread, id ); + + } else { + _ISR_Disable( level ); + if ( the_semaphore->count <= the_semaphore->Attributes.maximum_count ) + the_semaphore->count += 1; + else + status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED; + _ISR_Enable( level ); + } + + return status; +} + |